1. The failure of the main cylinder lifting movement of the oil research vane pump In the test, the main hydraulic pressure is hereinafter referred to as the main cylinder lifting movement as follows.
①. When the master cylinder and the slider are in two free states, the master cylinder can be lifted repeatedly. The lowering movement J is basically normal.
②. When the master cylinder drives the slider down, the master cylinder and slider cannot return upward after the slider contacts the workpiece and pressurizes it. At this time, there is no pressure display on the lifting pressure gauge.
, When the master cylinder drives the slider down to contact the workpiece, the pressure will no longer be boosted after the pressure reaches 3MPa. , described in this hydraulic shaker. Book the working principle of the original system of the hydraulic press, B is a hair-driven servo two-way variable pump, this Vickers oil pump not only provides working power, but also realizes the variable change in the station.
Second, the system is working principle analysis as follows. (The main cylinder drops rapidly at this time, the hydraulic pump.-From the working principle of the original system of the lower sleeve coin and hydraulic press.)
(1) The lower chamber of the master cylinder D sucks and opens the one-way valve, so that the liquid blue oil enters the upper chamber of the Meng cylinder along the pipeline a, and pushes the moving block to descend rapidly. When the oil in the main chamber of the master cylinder D is shown to be sufficient to form a negative pressure, the filling is done so that the oil in the king tank Tz is replenished.
(2) Workpiece pressurization When the slider contacts the workpiece, the resistance increases, the pressure in the upper chamber of the master cylinder rises, and the pressure value is displayed by the pressure gauge. Suction oil, maintain pressure to the oil supply well in the upper chamber of the master cylinder, and the maximum pressure value is set by the overflow valve.
